An Evaluation of Supported Scaffold

Safety(Presented at the 12th Annual

Construction Safety Conference, Rosemont, IL, May 2002)

Ken Halperin, PhDConsultantE-mail: ken@boo.net

Michael McCann, PhD, CIHDirector of Safety and ErgonomicsCenter to Protect Workers’ RightsE-mail: mmccann@cpwr.com

Fatal Falls from Supported Scaffolds, 1992-98

Total # of deaths = 267 (38/year) 217 falls (81%) 47 collapses (18%)

15 deaths (6%) dismantling scaffolds 6 deaths (2%) assembling scaffolds

Source: U.S. Bureau of Labor Statistics data

Research Methods Used a 150-point checklist to evaluate

scaffold safety practice Rated scaffolds as acceptable or

unacceptable Evaluated 113 scaffolds in 9 areas of

Eastern U.S. Also evaluated information on worksite,

workforce, and scaffold competent person.

Results

36 of the 113 scaffolds (32%) were unacceptable and posed imminent hazards: danger of collapse missing planking, guardrails, and/or inadequate access

77 scaffolds (68%) were acceptable and posed no imminent danger to the workers.

30 Scaffolds (27%) Had Structural Flaws

Missing or improperly supported base plates 17 Scaffold not tied

properly to building 13 Platform not level 6 Some runners missing 3 Some jacks overextended 2 Severe overloading 2 Some posts incorrect 1 Some braces not tight 1

36 Scaffolds (32%) Had Fall Hazards

# fall hazards Missing mid guardrails 33 Missing top guardrails 28*

* Also missing midrails Improper access

Climbing scaffold frame 23 Other severe access problems 5

Partially planked platforms 26 Substandard planks 3

Correlation between Structural Flaws and Fall

Hazards

36 scaffolds were unacceptable 23 had both structural flaws and

fall hazards 10 had fall hazards only 3 had structural flaws only

Problems of Unacceptable Scaffolds

36 scaffolds were unacceptable 92% were missing guardrails 83% had structural flaws 78% had poor access 72% were insufficiently planked

Scaffold Competent Person

Required by OSHA 29 CFR 1926.451(f)(3) requires inspections

by competent person before each work shift and after occurrences which could affect scaffold structural integrity

Competent person Recognize hazards Authorized to take corrective action

Competent Persons on Scaffold Sites

104 sites had workers present 82 (79%) had competent persons 10 sites (10%) said competent person was not present 72 competent persons were interviewed

Only 32 (44%) had scaffold safety training

Need for Competent Person Scaffold Safety Training

32 sites had competent persons who had scaffold safety training 25 scaffolds (78%) were acceptable

62 sites had no competent person or had one without scaffold safety training 24 scaffolds (39%) were acceptable

Importance of Scaffold Erector

72 scaffolds erected by scaffold user 43 (60%) were acceptable

41 scaffolds erected by scaffold erection contractor 34 (83%) were acceptable

Effect of Union Status of Scaffold Erector

49 scaffolds erected by union contractors 38 (78%) were acceptable

64 scaffolds erected by non-union contractors 39 (61%) were acceptable

Effect of Type of Supported Scaffold

86/113 scaffolds (76%) were frame scaffolds 54 frame scaffolds (63%) were

acceptable

27 scaffolds (24%) were other types of scaffolds 23 other scaffolds (85%) were acceptable

Summary of Proper Scaffold Safety Practice -1

Unacceptable scaffolds have both: Structural flaws

Missing or improperly supported base plates

Improper tying off to building Uneven platform slope

Fall protection hazards Missing planking and/or guardrails Inadequate access

Summary of Proper Scaffold Safety Practice - 2

Strong correlations with: Presence of competent person with scaffold

safety training Use of non-frame scaffolds Scaffold erected by scaffold erection

company Slightly weaker correlation with union

status of scaffold erector

Summary of Proper Scaffold Safety Practice - 3

No correlation with: Location Site size Number of workers on the scaffold Trade of scaffold workers

Recommendations

Hire an outside scaffold erector Have competent person on site

who has had scaffold safety training

Consider whether frame scaffolds are the best choice

Perform regular inspections

Quick Scaffold Inspection Checklist

Check for missing planks on platforms Check for missing guardrails Check for proper access Check for proper tying off to buildings

Note: The first 3 points find 92% of unacceptable scaffolds

Missing Planks

Missing Guardrails

Improper Access

Electronic Library of Construction Safety and Health (eLCOSH):

www.elcosh.orgThe Center to Protect Workers’ Rights

www.cpwr.com

This presentation was funded by research grant U60 CCU 317202 from the National Institute for Occupational Safety and Health (NIOSH) through The Center to Protect Workers’ Rights, Silver Spring, Md. The contents are solely the responsibility of the authors and do not necessarily represent the official views of NIOSH.

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